package jisuan4h9t;

import java.util.Scanner;
import static java.lang.Math.PI;

public class bijiaoArea {
    public void bj(){
        System.out.println("请输入正方形边长，长方形长和宽，圆的半径");
        Scanner scanner = new Scanner(System.in);
        double a = scanner.nextDouble();
        double l = scanner.nextDouble();
        double d = scanner.nextDouble();
        double r = scanner.nextDouble();
        double[] area={a*a,l*d,PI*r*r};
        if (area[0]>area[1]&&area[0]>area[2]){
            System.out.println("正方形");
        }else if (area[1]>area[2]){
            System.out.println("长方形");
        }else {
            System.out.println("圆");
        }
    }

    public static void main(String[] args) {
        new bijiaoArea().bj();
    }
}
